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# Tau

### Sunday, June 28, 2020

Tau Day
In 2001, Bob Palais published π Is Wrong, where he said pi (π) should not be used for the circle constant—the geometry of a circle expressed in a single number. Instead, he called for tau (τ), which is equal to 2π, or roughly 6.28318, to be used instead. Whereas π compares a circle's circumference to its diameter, τ is defined as the ratio of a circle's circumference to its radius. This means the measurement of the circumference of any circle is about 6.28318 times its radius. 2π is used quite often in mathematics, and proponents of tau say it would be much easier to simply replace that symbol with τ. In general, mathematicians write equations about circles using its radius as well, not its diameter.

On June 28, 2010, Michael Hartl published the Tau Manifesto, which stood behind Palais and expanded on his ideas. Like Palais, he called for tau to replace pi, saying pi is a "confusing and unnatural choice for the circle constant." He believed tau is a better way to describe the relationship between the circumference and the radius of a circle. With the release of his manifesto, he also created Tau Day. Just as 3/14 is Pi Day, 6/28 became Tau Day. It is an anti-Pi Day of sorts, and Hartl even called for Pi Day to be known as Half Tau Day. A growing number of mathematicians and physicists agree tau should replace pi, although this is not yet widely accepted.

Celebrate the day by eating something with a circular shape, such as pie or pizza. In order to celebrate the day differently than you would Pi Day, you should eat double the amount that you usually would, just as the number associated with tau is double the number associated with pi. You could watch videos about tau, or to get an in-depth understanding, you could read the Tau Manifesto. You could also pick up a Tau Day T-shirt, or see if you can find some Key Lime Tau beer.

4th of July Countdown ~ 6 days

Labor Day Countdown ~ 71 days

Autumn Countdown ~ 86 days

Did You Know ~
We have enough gun control. What we need is idiot control.
• POLSKARENIA
46 days ago
• LIS193

46 days ago
• INGMARIE
idiot control, I am afraid its too late😱😩😨😰🤯
Double up on the pizza,,,, I'm in

Have a great day
46 days ago
• SUSANBEAMON
The only problem with idiot control is where do we put them? And who is going to control them? I mean, one managed to get elected President.
46 days ago
• KEKEIKO
vroom ... right over my head
47 days ago
• IAMAGEMLOVER
Math is my subject, but not geometry. We definitely need idiot control.
47 days ago
• LINOVER
Don't recall ever seeing anything about Tau Day! We old folks (I'm 74) sometimes have trouble remiembering what pi is! Love the Did You Know - We definitely need idiot control - especially in Washington, D.C. Can't we send Pelosi home?
47 days ago
• PATRICIA-CR
OK, perfect. Understood (yeah, right!)
47 days ago
• ALICIA363

Stuff I never knew, and I love to learn!
47 days ago
• RAZZOOZLE
interesting
47 days ago
• CHARTING-BEAR

47 days ago
• 4CONNIESHEALTH

47 days ago
• JUDY1676
pi vs tau makes no sense to me but I do agree we need some idiot control!
47 days ago
• GGRSPARK
Well I actually followed that despite a serious math deficit. Idiot control would work for me but freedom allows for institutionalized idiocy.
47 days ago
• GODS-PRINCESS
Interest information!
47 days ago
• 1CRAZYDOG
For sure need idiot control. They're outnumbering us fast.
47 days ago
• NEW-CAZ

47 days ago
• JACKIEWALKS4FUN

47 days ago
• NANASUEH
Definitely need idiot control.

47 days ago
• PACEKA1
I agree with the Did you Know - we certainly need some idiot control!

And very interesting information about pi vs tau - even if I really have no idea how it works!
47 days ago
• JOHNMARTINMILES
Awright!

Keep on Keeping on!

Make today the greatest day of your life!
Until tomorrow!